Breitbart is a mad genius, and the left has turned their usual strategy toward him:

Attack, attack, attack.

What interests me is the extent to which they're revising reality in order to go after him. For example:

Andrew Breitbart offers $100,000 for hard video evidence of Tea Party protesters hurling racial epithets. Various left-wing blogs re-invent that offer as $100,000 for video evidence of a Tea Party protester sptting on Emanuel Cleaver, and produce a video in which the man can clearly be seen bellowing at Cleaver through cupped hands.

Then they suggest that the spit in question was mid-bellow spray is "ridiculous".